Since things are pretty bad and future is bleak even for ruling elites, I am sure there are many opportunities S. Korean gov can exploit.
However, I am not sure about active subversion. They do have some underground network of Christians and passing infos, though.
I have a friend in a church group that smuggled bibles into North Korea. They searched the groups hotel room, but the group heard them coming and moved the bibles to the next room and hid them. The N. Korean police set themselves up IN THE ROOM that they had hidden the Bibles in — and didn’t find them since they didn’t search that room. Pretty cool, huh?